Metro weekly water update - 27 July 2018





July water use to date

15 billion litres

16 billion litres

Dam storage levels



Streamflow into dams
(cumulative May 2018 – April 2019)

25 billion litres

25 billion litres

July rainfall to date


(July mean rainfall 1994-2017)


Note: 1 billion litres = approx. 400 Olympic swimming pools.  Please note these figures are rounded (except for rainfall) to the nearest whole number.


Water use


Average daily water use over the last week was 572 million litres, which was slightly above the forecast of 560 million litres.  Since 1 July 2018 we have used 15 billion litres of water, which is about half a billion litres more than what we had forecast.


Dam levels


Over the last seven days, Perth’s dam storage levels have increased (by 11 billion litres) from 272 billion litres to 283 billion litres of usable storage. Perth’s dams store water from three different sources… groundwater and desalinated seawater transferred from treatment plants as well as streamflow (produced by rainfall).




Over the last seven days Perth’s dams (15 dams in total) have received about 7.5 billion litres of streamflow.  Since May, they have received about 25 billion litres of streamflow.


Sprinkler roster compliance


The Winter Sprinkler Switch-off now applies, and our inspectors issued 110 warnings and 16 fines this week.  Since 1 January 2018, we have taken a total of 5996 actions (warnings + fines) compared with 6418 actions for the same period in 2017.


Annual rainfall

Perth has received 469.2 mm of rainfall since January this year.  According to updated figures released by the Bureau of Meteorology the cumulative mean rainfall (1994-2017) for the Perth metro for the January to July period is 450.1mm.


General water news

It is encouraging to see fines and warnings for sprinkler infringements are down in 2018 compared to the same time last year.

When a member of the public reports a sprinkler breach, the Water Corporation will issue a warning.  An Infringement Notice ($100 fine) is issued when the sprinklers are in use and sighted by an Inspector. 

One of the challenges the Water Corporation faces is that it must comply with the Privacy Act 1988, so when someone reports a sprinkler issue we cannot go back to that person who reported it about what action was taken.

This can sometimes lead to frustration and the perception that the issue is not being addressed – this is definitely not the case!

Members of the community play an important role in saving water and we encourage you to report any sprinkler breaches you see, because it is a really effective way of changing the community’s watering habits and saving water.

You can report a breach by phoning 13 10 39 or online at:


Media Enquiries:

Contact: Clare Lugar

Position: Manager Media & Strategic Communications

Phone: (08) 9420 3043